One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,11)(8,10)(9,12)(14,17)(18,19)(22,26)(23,29)(24,32)(34,36) involution — undirected(5,7,10,9)(6,11,8,12)(13,14,16,17)(15,19,20,18)(22,26)(27,30)(28,33)(34,36)(6,8)(11,12)(13,14)(15,18)(16,17)(19,20)(21,22,25,26)(23,30,29,27)(24,28,32,33)(31,36,35,34)(1,2,3,4)(5,8,10,6)(7,12,9,11)(21,23)(22,27)(24,31)(25,29)(26,30)(28,34)(32,35)(33,36)(5,9,10,7)(6,12,8,11)(13,15)(14,18)(16,20)(17,19)(21,24,25,32)(22,28,26,33)(23,31,29,35)(27,34,30,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.